Kharis & The Beholder (HTR18)

Flying
When Kharis & The Beholder enters the battlefield and at the beginning of your upkeep, create a 1/1 white Human creature token and make a charisma check. (Roll a d20.)
• If the result plus the number of creatures you control is greater than 11, put a +1/+1 counter on each creature you control.
• If the result is a natural 20, for each nonlegendary creature you control, create a token that's a copy of that creature.

Legalities

• brawl: banned
• commander: legal
• legacy: legal
• modern: legal
• pauper: legal
• pioneer: banned
• standard: banned
• vintage: legal

Links

• Scryfall
• Gatherer
• TCGplayer